Add MAnet

[azkalot1]

Paper: https://ieeexplore.ieee.org/abstract/document/9201310
Seems to work better than Unet, similar to Unet++ but faster

An implementation is similar to the original in the paper, except for encoder part.

[qubvel]

A few more things:

• Update README.md
• Update docs/models.rst
• Check new model docstring to be constistent with existing model docstrings

May be write a little bit more in description of the model in docstring

[qubvel]

👍

[ynhuhu]

Thanks sharing！
I installed segmentation_models_pytorch
model = smp.MAnet(encoder_name=ENCODER, encoder_weights=ENCODER_WEIGHTS,
classes=len(CLASSES),
activation=ACTIVATION,
)

module 'segmentation_models_pytorch' has no attribute 'MAnet'
Why？

[qubvel]

Install the latest version, look at the instructions in README.md

[pritesh-aidash]

I have the latest version. MAnet still does not show up.

[felipemello1]

@pritesh-aidash @qubvel same thing for me.

So I did

import segmentation_models_pytorch as smp
smp??

And it showed

from .unet import Unet
from .unetplusplus import UnetPlusPlus
from .manet import MAnet
from .linknet import Linknet
from .fpn import FPN
[...]

trying to do smp.MAnet doesnt work, but smp.manet.MAnet does